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Bubble acceleration in the ablative Rayleigh-Taylor instability.

R Betti1, J Sanz

  • 1Fusion Science Center for Extreme States of Matter and Fast Ignition Physics, Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.

Physical Review Letters
|December 13, 2006
PubMed
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The Rayleigh-Taylor instability (RTI) in inertial confinement fusion shows a newly discovered nonlinear bubble acceleration phase. Ablative RTI grows faster than classical RTI in the nonlinear regime for deuterium and tritium targets.

Area of Science:

  • Plasma Physics
  • Fluid Dynamics
  • Inertial Confinement Fusion

Background:

  • The Rayleigh-Taylor instability (RTI) is a critical phenomenon in fluid dynamics, particularly relevant to inertial confinement fusion (ICF) implosions.
  • Understanding RTI's nonlinear evolution is essential for predicting ICF target performance and stability.

Purpose of the Study:

  • To investigate the highly nonlinear evolution of single-mode RTI at the ablation front in ICF-relevant conditions.
  • To discover and characterize new phases of bubble evolution in ablative RTI.

Main Methods:

  • Numerical simulations were employed to model the single-mode RTI.
  • The study focused on the parameter range typical of ICF implosions, considering deuterium and tritium ablators.

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Main Results:

  • A novel phase of nonlinear bubble acceleration was identified, exceeding classical velocity predictions.
  • Bubble acceleration is driven by vorticity accumulation due to mass ablation and convection.
  • Ablative RTI exhibits faster nonlinear growth rates compared to classical RTI for D-T ablators, despite slower linear growth.

Conclusions:

  • The nonlinear dynamics of ablative RTI are significantly different from classical RTI, featuring accelerated bubble growth.
  • Vorticity dynamics play a crucial role in the enhanced nonlinear growth of RTI in ICF scenarios.
  • These findings have implications for ICF target design and stability analysis.